SandSnap grain-size analysis and photos from North Core Banks, NC in October 2022

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Frequently anticipated questions:

What does this data set describe?

Title:
SandSnap grain-size analysis and photos from North Core Banks, NC in October 2022
Abstract:
These data map in high detail surficial cross-sections of North Core Banks, a barrier island in Cape Lookout National Seashore, NC, in October 2022. U.S. Geological Survey field efforts are part of an interagency agreement with the National Park Service to monitor the recovery of the island from Hurricanes Florence (2018) and Dorian (2019). Three sites of outwash, overwash, and pond formation were targeted for extensive vegetation ground-truthing, sediment samples, bathymetric mapping with a remote-controlled surface vehicle, and uncrewed aerial systems (UAS) flights to collect multispectral imagery. Five semi-permanent ground control points were also installed and surveyed to act as control for additional aerial imagery collects via plane. UAS imagery were processed in Agisoft Metashape (v. 1.8.1) with surveyed temporary ground control points to produce calibrated multispectral (red, blue, green, red edge, near infrared, and panchromatic) orthoimages and digital surface models.
Supplemental_Information:
For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2022034FA. Bounding coordinates include the extent of where the photos were taken. Images can be viewed on the USGS Imagery Data System without downloading them here https://cmgds.marine.usgs.gov/idsviewer/data_release/10.5066-P99IV3FC.
  1. How might this data set be cited?
    Over, Jin-Si R., Sherwood, Christopher R., and Evans, Alexandra D., 20230328, SandSnap grain-size analysis and photos from North Core Banks, NC in October 2022: data release DOI:10.5066/P99IV3FC, U.S. Geological Survey, Coastal and Marine Hazards and Resources Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Over, Jin-Si R., Sherwood, Christopher R., Cramer, Jennifer M., Evans, Alexandra D., and Zeigler, Sara L., 2023, Topographic, bathymetric, multispectral, vegetation, sediment, and supporting GPS data collected on North Core Banks, Cape Lookout National Seashore, North Carolina in October 2022, U.S. Geological Survey Field Activity 2022-034-FA: data release DOI:10.5066/P99IV3FC, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Over, J.R., Sherwood, C.R., Cramer, J.M., Evans, A.D., and Zeigler, S.L, 2023, Topographic, bathymetric, multispectral, vegetation, sediment, and supporting GPS data collected on North Core Banks, Cape Lookout National Seashore, North Carolina in October 2022, U.S. Geological Survey Field Activity 2022-034-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P99IV3FC.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -76.338910
    East_Bounding_Coordinate: -76.075029
    North_Bounding_Coordinate: 35.039975
    South_Bounding_Coordinate: 34.840117
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/63af033ed34e92aad3ca5ed3?name=2022034FA_NCB_Sediment_browse.JPG&allowOpen=true (JPEG)
    A picture displaying the beach prepped to take a SandSnap.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 17-Oct-2022
    Currentness_Reference:
    Ground condition; multiple collection days.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (96)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 18
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -75.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983 (National Spatial Reference System 2011).
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988 using Geoid 18
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    2022-034-FA_NCB_General_SandSnaps.zip
    Closeup images of sand with a quarter for scale. (Source: producer-defined)
    2022-034-FA_NCB_SedimentSample_SandSnaps.zip
    Closeup images of sand with a quarter for scale. These images are also associated with an analyzed sediment sample. (Source: producer-defined)
    2022034FA_NCB_SandSnap_PhotoData.csv
    Data spreadsheet containing photo locations and the grain-size analysis results from SandSnap. (Source: U.S. Geological Survey)
    INFO
    USGS Field Activity Number (Source: USGS) Character string.
    Date
    Feature date in format MM/DD/YYYY where MM is the month, DD is the day, and YYYY is the year. (Source: USGS) Character string.
    Time_UTC
    Smartphone timestamp of photo in Coordinated Universal Time UTC HH:MM:SS, where HH is hours, MM is minutes, and SS is seconds. (Source: producer defined) Character string
    Photo ID
    Identifier for photos. (Source: producer defined) Character string.
    Notes
    Relevant comments describing location of photo. None recorded indicates no notes were taken. (Source: producer defined) Character string.
    Easting_UTM18N
    X-coordinate of photo location in UTM 18N. (Source: U.S. Geological Survey)
    Range of values
    Minimum:377583.205
    Maximum:401945.826
    Units:meters
    Northing_UTM18N
    Y-coordinate of photo location in UTM 18N. (Source: U.S. Geological Survey)
    Range of values
    Minimum:3856128.834
    Maximum:3878008.757
    Units:meters
    Orthometric_height_NAVD88
    Z-coordinate of photo location relative to NAVD88 using geoid 18. Negative values are below the geoid. (Source: U.S. Geological Survey)
    Range of values
    Minimum:-29.164
    Maximum:23.852
    Units:meters
    Latitude_NAD83[2011]
    Latitude coordinate, in decimal-degrees, of photo location (NAD83[2011]). South latitude is recorded as negative values. (Source: U.S. Geological Survey)
    Range of values
    Minimum:34.840117
    Maximum:35.039975
    Units:Decimal degrees
    Longitude_NAD83[2011]
    Longitude coordinate, in decimal degrees, of photo location (NAD83[2011]). West longitude is recorded as negative values. (Source: USGS East Coast Sediment Texture Database data dictionary)
    Range of values
    Minimum:-76.338910
    Maximum:-76.075029
    Units:Decimal degrees
    Ellipsoid_height_NAD83_2011
    Feature RTK height above the (NAD83[2011] GRS80) ellipsoid from the SP80. (Source: producer defined)
    Range of values
    Minimum:-67
    Maximum:-14
    Units:meters
    SandSnap ID
    Unique point identification number that corresponds to data stored in the SandSnap database. (Source: SandSnap)
    ValueDefinition
    NaNNull value – not generated
    Range of values
    Minimum:977
    Maximum:1180
    SandSnap Median Grain Size (mm)
    Midpoint of grain-size distribution as determined by the SandSnap model. (Source: SandSnap)
    ValueDefinition
    NaNNull value – not generated
    Range of values
    Minimum:0.12
    Maximum:1.98
    SandSnap Classification
    Grain-size classification (Source: SandSnap)
    ValueDefinition
    very fine sandMedian grain size is between 0.062 and 0.125 mm
    coarse sandMedian grain size is between 0.5 and 1 mm
    very coarse sandMedian grain size is between 1 and 2 mm
    NaNNull value – not generated
    Entity_and_Attribute_Overview:
    These data are available in a CSV format. The first line of the CSV file is a header line, and those labels are the same as defined in the attribute section. No data values are represented by NaN.
    Entity_and_Attribute_Detail_Citation: USGS Field Activities 2022-034-FA

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Jin-Si R. Over
    • Christopher R. Sherwood
    • Alexandra D. Evans
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Jin-Si R. Over
    U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2297 (voice)
    jover@usgs.gov

Why was the data set created?

Photos of the beach surface were taken next to a quarter for scale. The images were uploaded to the Sandsnap database to estimate grain size with a deep learning neural network (https://sandsnap-erdcchl.hub.arcgis.com). These grain-size data may be used in numerical models of coastal dynamics and to better understand how the channels and ponds formed during Hurricane Dorian fill in.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 19-Oct-2022 (process 1 of 2)
    A smartphone picture was taken of the surface with a quarter for scale to use with SandSnap. Instructions are available on https://experience.arcgis.com/experience/f55871e51fcd4ae7a3a855e9f89a1f2a/page/Collecting-SandSnaps.
    Date: Feb-2023 (process 2 of 2)
    The images were uploaded to SandSnap and the resulting ID, median grain size, and classification are reported in a CSV. Some images failed to upload and do not have grain size data. The images that failed to upload were still provided in the event that they may be ingested into SandSnap in the future. Person who carried out this activity:
    Jin-Si R. Over
    U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
    Geographer
    U.S. Geological Survey
    Woods Hole, MA

    508-548-8700 x2297 (voice)
    jover@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Photos were taken according to the SandSnap instructions, and grain-size accuracy was estimated with a trained model detailed on the website (https://sandsnap-erdcchl.hub.arcgis.com). Images that were improperly taken that have shadows, an unsmooth surface, are blurry, or from too far a distance may not be as accurate or may fail to return results. There is no way to validate the SandSnap grain-size estimate without sediment samples.
  2. How accurate are the geographic locations?
    Horizontal positions for the images are determined by smartphone GPS and are imbedded in the image. The expected absolute, horizontal accuracy is 2 to 5 meters, although some images may have larger inaccuracies due to poor cell service.
  3. How accurate are the heights or depths?
    Vertical positions for the images are determined by smartphone GPS and are embedded in the image. The expected absolute, vertical accuracy is 5 to 10 meters, although some images may have larger inaccuracies due to poor cell service
  4. Where are the gaps in the data? What is missing?
    All images were uploaded to SandSnap but not all images returned a result. No-data is represented using NaN. Additional information not in the CSV (for example: Town, Coin Reference, and Model Training Date) are generated by SandSnap. These data are available on the site and can be found by searching the SandSnap ID of each sample.
  5. How consistent are the relationships among the observations, including topology?
    There are 96 images and 18 have sediment samples associated with them. The SandSnap IDs are not consecutive due to errors uploading to SandSnap.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints None.
Use_Constraints Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    United States

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? This dataset contains photos and grain-size data from SandSnap collected on North Core Banks in October 2022.
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 28-Mar-2023
Metadata author:
Jin-Si R. Over
U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
Geographer
U.S. Geological Survey
Woods Hole, MA

508-548-8700 x2297 (voice)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the person is no longer with USGS.
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/SB_data_release/DR_P99IV3FC/2022034FA_NCB_SandSnap_meta.faq.html>
Generated by mp version 2.9.51 on Tue Mar 28 17:25:49 2023